Telescopic dipperstick



0 United States Patent [72] inventor John S. Pllch [56] References CitedW613, Massachusetts UNITED STATES PATENTS [2U PP 3 2,984,373 5/1961Przybylski 214/141 [221 FM 3,298,548 1/1967 Longetal 214/138Continuation-impart of Ser. No. 781,056, Dec. 4, 1968, abandoned.

[45] Patented Oct. 27, 1970 g y [73] Assignee Ware Machine Works, Inc.

Ware, Massachusetts a corporation of Massachusetts [54] TELESCOPICDIPPERSTICK 6 Claims, 11 Drawing Figs.

52 US. Cl. 214/138, 2 i 4/ l 41 [51 Int. Cl. E02f 3/30 PrimaryExaminer-Hugo O. Schulz Attorney-Dike, Thompson and Bronstein cylinderand the telescoping member being controlled by a second hydrauliccylinder, both of the cylinders being mounted externally on theapparatus preferably substantially parallel to each other when viewedfrom the'top and off center of the center line of the telescoping memberin a manner such that they are protected by the telescoping member whendigging with the bucket.

Patented Oct. 27, 1970 3,536,217

sheet of 4 FIG.

r m I w v g INVENTQR g JOHN PILCH ATTORNEYS Patented Oct. 27, 1970 Sheet Patented Oct. 27, 1970 3,536,217

Sheet 3 of4 Patented Oct. 27, 1970 Sheet 1 of 4 INVENTOR JOH N S. Pl LCHATTOR NEYS l TELESCOPIC DIPPERSTICK This application is acontinuation-in-part of copending US.

abandoned.

BACKGROUND OF THE INVENTION This invention relates generally totrenchers or backhoes and is directed more particularly to a new andimproved telescopic dipperstick construction for use therewith.

Telescopic dipperstick constructions are shown in the prior art in myUS. Pat. No. 3,140,000 issued July 7, 1964. In the prior artconstructions, as shown in that patent two hydraulic cylinders areprovided, one for rotating the bucket and the other for moving thetelescopic dipperstick member longitudinally with respect to the outeror first dipperstick member. The hydraulic cylinders in the abovementioned patent are mounted such that the cylinder for operating thebucket is positioned directly over and above the cylinder for moving thetelescopic member. In the form shown in US. Pat. No. 3,140,000, thecylinder for moving the telescopic member is placed in side of thetelescopic member. Although this construction has been found to beacceptable it has some disadvantages which not only make it costly tomanufacture but also make it difficult to service.

It is an object of this invention to provide a new and improvedtelescopic dipperstick construction which is economical to manufactureand relatively easy to service and repair.

Another object of the invention is to provide a new and improvedtelescopic dipperstick wherein the hydraulic means for positioning thetelescopic or bucket support portion of the dipperstick as well as thehydraulic means for rotating the bucket are both externally mounted.

A further object of this invention is to provide a new and improveddipperstick construction wherein both of said hydraulic means arepositioned externally and preferably parallel to each other'when viewedfrom the top.

Another object of the invention is to provide a new and improvedtelescopic dipperstick construction which allows a mechanic toeasily'service the hydraulic cylinders and which because the cylindersare side by side makes for a less bulky construction.

Other objects and advantages of the invention will be apparent from thefollowing description taken in conjunction with the accompanyingdrawings.

It will be understood that changes may be made in the details of theconstruction and arrangement of parts shown and described, as thepreferred embodiments of the invention have been presented by way ofillustration only.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a side view of a tractor mounted apparatus including adipperstick embodying the invention;

FIG. 2 is an enlarged side view of the dipperstick shown in FIG. 1;

FIG. 3 is a top plan view of the dipperstick shown in FIG. 2;

FIG. 4 is a section taken along the line 4-4 of FIG. 2;

FIG. 5 is a side view of another embodiment of a dipperstick embodyingthe invention;

FIG. 6 is a top plan view of the apparatus shown in F IG. 5;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 5;

FIG. 8 is a side view of another embodiment of a dipperstick embodyingthe invention;

FIG. 9 is a partial top plan view of the apparatus shown in FIG. 8;

FIG. 10 is a perspective of the supporting member of the apparatus shownin FIG. 8; and

FIG. 11 is a section on the line 11-11 of FIG. 8.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now more particularlyto the drawings wherein similar reference characters designatecorresponding parts throughout, the invention relates particularly to anapparatus adaptable for use with a machine such as a trencher or backhoewhich includes a boom and a bucket supported by a dipperstick. In thedrawings the trencher or backhoe is shown mounted on a tractor, thehydraulic system of which provides hydraulic power for the boom, bucketand dipperstick. The tractor shown is of the track type and includes anengine 10, tracks 11, seat 12 and a boom 13. The boom 13 is pivotallyconnected at 14 to a support 15 which in turn is pivotally connected at16 to a support 17, which is detachably connected to the tractor.

The boom 13 is adapted to be raised and lowered by a hydraulic cylinder21 connected adjacent its opposite ends at 22 and 23 to boom 13 andsupport 15 respectively.

Adjacent the free end of the boom 13 there is pivotally connected atelescopic dipperstick 19. The dipperstick 19 in this embodiment isshown in FIGS. 1 through 4 of the drawings. It comprises a supportmember 20 pivotally connected at 20A to the boom 13. At 26 there isshown a hydraulic cylinder having a ram 27, the cylinder being coupledat one end to the boom 13 at 28 and the ram being coupled at 208 to thesupport member 20. The hydraulic cylinder 26 is provided for rotatingthe telescopic dipperstick 19 about the pivot point 20A.

The support member 20 includes a plurality of members shown in FIG. 4 at30, 31, 32 and 33 constructed to provide a guide means or guide passagehaving a wear plate shown at 34 provided therein. Within the guidepassage there is positioned for slidable movement therein a telescopicmember shown at 35. At one end of the telescopic member 35 there issupported a bucket 38 which is pivotally connected at 39 to thetelescopic member 35.

Pivotally mounted linkage means generally shown at 40 is provided andincludes both bucket pivot links 41A and 41B and bucket extension links42A and 428. Links 41A and 41B are pivotally connected to the telescopicmember 35 and links 42A and 42B are pivotally connected to the bucket.The links 41A, 41B, 42A and 42B are pivotally connected together and toa ram 44 of the bucket control cylinder 45. The bucket control cylinderis itself pivotally coupled at one end thereof by a hitch 46 to thetelescopic member 35. It will be noted that the ram 44 as well as thecylinder 45 are positioned off center of the centerline of thetelescopic member 35 when viewed from the top in FIG. 3 and accordinglythe links 41A, 41B, 42A and 42B are constructed such that they areconnected to the ram 44 off center from the center line of thetelescopic member 35.

In order to move the telescopic member 35 longitudinally within thesupport member 20 there is provided a hydraulic cylinder 49 which at oneend thereof is pivotally coupled at 50 to the member 20. The ram 51 ofthe hydraulic cylinder is pivotally connected at 52 to the telescopicmember 35.

It is to be noted that the bucket control cylinder 45 as well as thecylinder 49 are positioned externally of the telescopic member 35 aremounted in a side by side, parallel relationship when viewed from thetop. In this way they are easily, readily accessible for servicing andin addition the telescopic member protects them from damage in use sincethey are on the opposite side of the telescopic member from thebucket.

Turning now to FIGS. 5 through 7 wherein another embodiment of theinvention is shown, in this embodiment the bucket rotating hydrauliccylinder is shown at 60 and is mounted by use of a welded cylinder hitch61 to the telescopic member 35.

With this construction the telescopic member 35 does not move anyfurther to the right than the position in which it is shown in FIG. 6.If the design of a machine is such that a long bucket rotating cylinderis satisfactory it can be constructed as shown in FIGS. 1 through 4whereas if a shorter bucket rotating cylinder is necessary, theconstruction shown in FIGS. 5 through 7 would be preferable.

Turning now to FIGS. 8 through 10 wherein a third embodiment is shown,in this embodiment the support member 20C is extended forwardly towardsthe bucket from the pivot point 20A thereby adding support for thetelescopic member closer to the bucket. In this embodiment. the cylinderhitch 80 is welded to the top wall of the telescopic member and itslides longitudinally of the slot 31A provided in the top wall 31 of thesupport memberwhen the telescopic member 35 is moved longitudinally.relative to the support memberby the ram 51. I V

As shown best in FIGS. and 11, bearing plates 90, are

, provided adjacent to'the forward end of the support member C andbearing plates 92, 93 are provided adjacent to the other end. If desiredthese bearing plates may telescoping member-35rather than to the walls31 and 33 of i the support member20C. V

The side by side location of the cylinders both outside of the supportand the telescopic member as shown in FIGS. 1 through 10 is a less bulkyarrangement of parts than the prior art constructions whichshowonecylinder positioned in the telescopic'member and the other aboveitwWith this invention both cylinders are exposed foreasy service andrepair. The operation of the devicewill be apparent to persons skilledin the art from the foregoing description. 1

While three desirable embodiments of the" invention have 1 been shown inthe drawings, it is to be understood that this disclosure is for thepurpose of illustration only and that various changes in shape,proportion and arrangement of parts as well as the substitution ofequivalent elements for those herein shown and described,:may be madewithout departing from the-spirit and scope of the invention as setforth in the aps pended claims.

I claim:

1. In a device of the character described, a telescopic dipperstickassembly for mounting on a boom or the like, comprising in combination asupporting member suitable for attachment tothe boom, said supportingmember having a guide passage formed therein, a telescopic memberslidably supported in said guide passage, a bucket pivotally connectedto be attached to the 4 i the telescopic member at one end thereof,linkage means connected to said bucket and; said telescopic member, afirst hydraulicv means coupled at one end to said supporting member andat the other end to said telescopic member, a a second hydraulic meanscoupled atjone end to said telescopic member and at the other endto..said linkage means, said first t and secondhydraulic means beingpositioned above said supthe top.

porting and telescopic members, in a sideby side relationship and withtheir longitudinal axes at opposite sides of the center .line of saidsupporting memberwhenthe dipperstick assembly is viewed from the top.

2. An assembly according to claim. 1 wherein said first andsecondvhydraulic means are positioned substantially parallel to eachother when the dipperstick assembly is viewed from 3. An assemblyaccording toclaini'l in which the'second hydraulic means is coupled tothe telescopic member at a point between the ends of the supportingmember.

4. An assembly according to claim 3 in whicha longitudinallyzextendingopening is provided in the top of the supporting member and-the means.for coupling the second hydraulic. meansto the telescopic member extendsthrough I said opening.

5. An assemblyaccording to claim 1 inwhich the linkage means ispivotally coupled to said second hydraulic means off

